I've found [Plannotator]( https://github.com/backnotprop/plannotator) useful for this. It opens the plan on a minimal web page so I can highlight and add comments. This is then passed back to Claude code. Works well enough for now. But ideally this should be natively implemented in cc.
I extensively tried to use this and couldn't get it working. I'm running CC from a docker container and mostly use it from a web interface, but even setting it to just give a url, and using CC from the terminal, it would just not hook in correctly
